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f58851e6 TT |
1 | /* |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
38 | */ | |
39 | ||
40 | /* | |
41 | * transport.c | |
42 | * | |
43 | * This file contains the top-level implementation of an RPC RDMA | |
44 | * transport. | |
45 | * | |
46 | * Naming convention: functions beginning with xprt_ are part of the | |
47 | * transport switch. All others are RPC RDMA internal. | |
48 | */ | |
49 | ||
50 | #include <linux/module.h> | |
5a0e3ad6 | 51 | #include <linux/slab.h> |
f58851e6 | 52 | #include <linux/seq_file.h> |
5976687a | 53 | #include <linux/sunrpc/addr.h> |
f58851e6 TT |
54 | |
55 | #include "xprt_rdma.h" | |
56 | ||
f895b252 | 57 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
58 | # define RPCDBG_FACILITY RPCDBG_TRANS |
59 | #endif | |
60 | ||
f58851e6 TT |
61 | /* |
62 | * tunables | |
63 | */ | |
64 | ||
65 | static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; | |
66 | static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; | |
67 | static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; | |
68 | static unsigned int xprt_rdma_inline_write_padding; | |
3197d309 | 69 | static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; |
d5440e27 | 70 | int xprt_rdma_pad_optimize = 1; |
f58851e6 | 71 | |
f895b252 | 72 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
73 | |
74 | static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; | |
75 | static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; | |
76 | static unsigned int zero; | |
77 | static unsigned int max_padding = PAGE_SIZE; | |
78 | static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; | |
79 | static unsigned int max_memreg = RPCRDMA_LAST - 1; | |
80 | ||
81 | static struct ctl_table_header *sunrpc_table_header; | |
82 | ||
fe2c6338 | 83 | static struct ctl_table xr_tunables_table[] = { |
f58851e6 | 84 | { |
f58851e6 TT |
85 | .procname = "rdma_slot_table_entries", |
86 | .data = &xprt_rdma_slot_table_entries, | |
87 | .maxlen = sizeof(unsigned int), | |
88 | .mode = 0644, | |
6d456111 | 89 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
90 | .extra1 = &min_slot_table_size, |
91 | .extra2 = &max_slot_table_size | |
92 | }, | |
93 | { | |
f58851e6 TT |
94 | .procname = "rdma_max_inline_read", |
95 | .data = &xprt_rdma_max_inline_read, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
6d456111 | 98 | .proc_handler = proc_dointvec, |
f58851e6 TT |
99 | }, |
100 | { | |
f58851e6 TT |
101 | .procname = "rdma_max_inline_write", |
102 | .data = &xprt_rdma_max_inline_write, | |
103 | .maxlen = sizeof(unsigned int), | |
104 | .mode = 0644, | |
6d456111 | 105 | .proc_handler = proc_dointvec, |
f58851e6 TT |
106 | }, |
107 | { | |
f58851e6 TT |
108 | .procname = "rdma_inline_write_padding", |
109 | .data = &xprt_rdma_inline_write_padding, | |
110 | .maxlen = sizeof(unsigned int), | |
111 | .mode = 0644, | |
6d456111 | 112 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
113 | .extra1 = &zero, |
114 | .extra2 = &max_padding, | |
115 | }, | |
116 | { | |
f58851e6 TT |
117 | .procname = "rdma_memreg_strategy", |
118 | .data = &xprt_rdma_memreg_strategy, | |
119 | .maxlen = sizeof(unsigned int), | |
120 | .mode = 0644, | |
6d456111 | 121 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
122 | .extra1 = &min_memreg, |
123 | .extra2 = &max_memreg, | |
124 | }, | |
9191ca3b | 125 | { |
9191ca3b TT |
126 | .procname = "rdma_pad_optimize", |
127 | .data = &xprt_rdma_pad_optimize, | |
128 | .maxlen = sizeof(unsigned int), | |
129 | .mode = 0644, | |
6d456111 | 130 | .proc_handler = proc_dointvec, |
9191ca3b | 131 | }, |
f8572d8f | 132 | { }, |
f58851e6 TT |
133 | }; |
134 | ||
fe2c6338 | 135 | static struct ctl_table sunrpc_table[] = { |
f58851e6 | 136 | { |
f58851e6 TT |
137 | .procname = "sunrpc", |
138 | .mode = 0555, | |
139 | .child = xr_tunables_table | |
140 | }, | |
f8572d8f | 141 | { }, |
f58851e6 TT |
142 | }; |
143 | ||
144 | #endif | |
145 | ||
bfaee096 CL |
146 | #define RPCRDMA_BIND_TO (60U * HZ) |
147 | #define RPCRDMA_INIT_REEST_TO (5U * HZ) | |
148 | #define RPCRDMA_MAX_REEST_TO (30U * HZ) | |
149 | #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) | |
150 | ||
f58851e6 TT |
151 | static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */ |
152 | ||
0dd39cae CL |
153 | static void |
154 | xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) | |
155 | { | |
156 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
157 | char buf[20]; | |
158 | ||
159 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); | |
160 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
161 | ||
162 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; | |
163 | } | |
164 | ||
165 | static void | |
166 | xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) | |
167 | { | |
168 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
169 | char buf[40]; | |
170 | ||
171 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
172 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
173 | ||
174 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; | |
175 | } | |
176 | ||
f58851e6 | 177 | static void |
5231eb97 | 178 | xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) |
f58851e6 | 179 | { |
0dd39cae CL |
180 | char buf[128]; |
181 | ||
182 | switch (sap->sa_family) { | |
183 | case AF_INET: | |
184 | xprt_rdma_format_addresses4(xprt, sap); | |
185 | break; | |
186 | case AF_INET6: | |
187 | xprt_rdma_format_addresses6(xprt, sap); | |
188 | break; | |
189 | default: | |
190 | pr_err("rpcrdma: Unrecognized address family\n"); | |
191 | return; | |
192 | } | |
f58851e6 | 193 | |
c877b849 CL |
194 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
195 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 196 | |
81160e66 | 197 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 198 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 199 | |
81160e66 | 200 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 201 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 202 | |
0dd39cae | 203 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
f58851e6 TT |
204 | } |
205 | ||
206 | static void | |
207 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) | |
208 | { | |
33e01dc7 CL |
209 | unsigned int i; |
210 | ||
211 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
212 | switch (i) { | |
213 | case RPC_DISPLAY_PROTO: | |
214 | case RPC_DISPLAY_NETID: | |
215 | continue; | |
216 | default: | |
217 | kfree(xprt->address_strings[i]); | |
218 | } | |
f58851e6 TT |
219 | } |
220 | ||
221 | static void | |
222 | xprt_rdma_connect_worker(struct work_struct *work) | |
223 | { | |
5abefb86 CL |
224 | struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, |
225 | rx_connect_worker.work); | |
226 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
f58851e6 TT |
227 | int rc = 0; |
228 | ||
d19751e7 TM |
229 | xprt_clear_connected(xprt); |
230 | ||
231 | dprintk("RPC: %s: %sconnect\n", __func__, | |
232 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); | |
233 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); | |
234 | if (rc) | |
235 | xprt_wake_pending_tasks(xprt, rc); | |
236 | ||
f58851e6 TT |
237 | dprintk("RPC: %s: exit\n", __func__); |
238 | xprt_clear_connecting(xprt); | |
239 | } | |
240 | ||
4a068258 CL |
241 | static void |
242 | xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) | |
243 | { | |
244 | struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt, | |
245 | rx_xprt); | |
246 | ||
247 | pr_info("rpcrdma: injecting transport disconnect on xprt=%p\n", xprt); | |
248 | rdma_disconnect(r_xprt->rx_ia.ri_id); | |
249 | } | |
250 | ||
f58851e6 TT |
251 | /* |
252 | * xprt_rdma_destroy | |
253 | * | |
254 | * Destroy the xprt. | |
255 | * Free all memory associated with the object, including its own. | |
256 | * NOTE: none of the *destroy methods free memory for their top-level | |
257 | * objects, even though they may have allocated it (they do free | |
258 | * private memory). It's up to the caller to handle it. In this | |
259 | * case (RDMA transport), all structure memory is inlined with the | |
260 | * struct rpcrdma_xprt. | |
261 | */ | |
262 | static void | |
263 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
264 | { | |
265 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 TT |
266 | |
267 | dprintk("RPC: %s: called\n", __func__); | |
268 | ||
5abefb86 | 269 | cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
f58851e6 TT |
270 | |
271 | xprt_clear_connected(xprt); | |
272 | ||
273 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); | |
7f1d5419 | 274 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
275 | rpcrdma_ia_close(&r_xprt->rx_ia); |
276 | ||
277 | xprt_rdma_free_addresses(xprt); | |
278 | ||
e204e621 | 279 | xprt_free(xprt); |
f58851e6 TT |
280 | |
281 | dprintk("RPC: %s: returning\n", __func__); | |
282 | ||
283 | module_put(THIS_MODULE); | |
284 | } | |
285 | ||
2881ae74 TM |
286 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
287 | .to_initval = 60 * HZ, | |
288 | .to_maxval = 60 * HZ, | |
289 | }; | |
290 | ||
f58851e6 TT |
291 | /** |
292 | * xprt_setup_rdma - Set up transport to use RDMA | |
293 | * | |
294 | * @args: rpc transport arguments | |
295 | */ | |
296 | static struct rpc_xprt * | |
297 | xprt_setup_rdma(struct xprt_create *args) | |
298 | { | |
299 | struct rpcrdma_create_data_internal cdata; | |
300 | struct rpc_xprt *xprt; | |
301 | struct rpcrdma_xprt *new_xprt; | |
302 | struct rpcrdma_ep *new_ep; | |
5231eb97 | 303 | struct sockaddr *sap; |
f58851e6 TT |
304 | int rc; |
305 | ||
306 | if (args->addrlen > sizeof(xprt->addr)) { | |
307 | dprintk("RPC: %s: address too large\n", __func__); | |
308 | return ERR_PTR(-EBADF); | |
309 | } | |
310 | ||
37aa2133 | 311 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 312 | xprt_rdma_slot_table_entries, |
bd1722d4 | 313 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
314 | if (xprt == NULL) { |
315 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
316 | __func__); | |
317 | return ERR_PTR(-ENOMEM); | |
318 | } | |
319 | ||
f58851e6 | 320 | /* 60 second timeout, no retries */ |
ba7392bb | 321 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
322 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
323 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
324 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
325 | |
326 | xprt->resvport = 0; /* privileged port not needed */ | |
327 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
328 | xprt->ops = &xprt_rdma_procs; |
329 | ||
330 | /* | |
331 | * Set up RDMA-specific connect data. | |
332 | */ | |
333 | ||
5231eb97 CL |
334 | sap = (struct sockaddr *)&cdata.addr; |
335 | memcpy(sap, args->dstaddr, args->addrlen); | |
f58851e6 TT |
336 | |
337 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
338 | * address, for any side protocols which peek at it */ | |
339 | xprt->prot = IPPROTO_TCP; | |
340 | xprt->addrlen = args->addrlen; | |
5231eb97 | 341 | memcpy(&xprt->addr, sap, xprt->addrlen); |
f58851e6 | 342 | |
5231eb97 | 343 | if (rpc_get_port(sap)) |
f58851e6 TT |
344 | xprt_set_bound(xprt); |
345 | ||
f58851e6 TT |
346 | cdata.max_requests = xprt->max_reqs; |
347 | ||
f58851e6 TT |
348 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ |
349 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
350 | ||
351 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
352 | if (cdata.inline_wsize > cdata.wsize) | |
353 | cdata.inline_wsize = cdata.wsize; | |
354 | ||
355 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
356 | if (cdata.inline_rsize > cdata.rsize) | |
357 | cdata.inline_rsize = cdata.rsize; | |
358 | ||
359 | cdata.padding = xprt_rdma_inline_write_padding; | |
360 | ||
361 | /* | |
362 | * Create new transport instance, which includes initialized | |
363 | * o ia | |
364 | * o endpoint | |
365 | * o buffers | |
366 | */ | |
367 | ||
368 | new_xprt = rpcx_to_rdmax(xprt); | |
369 | ||
5231eb97 | 370 | rc = rpcrdma_ia_open(new_xprt, sap, xprt_rdma_memreg_strategy); |
f58851e6 TT |
371 | if (rc) |
372 | goto out1; | |
373 | ||
374 | /* | |
375 | * initialize and create ep | |
376 | */ | |
377 | new_xprt->rx_data = cdata; | |
378 | new_ep = &new_xprt->rx_ep; | |
379 | new_ep->rep_remote_addr = cdata.addr; | |
380 | ||
381 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
382 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
383 | if (rc) | |
384 | goto out2; | |
385 | ||
386 | /* | |
387 | * Allocate pre-registered send and receive buffers for headers and | |
388 | * any inline data. Also specify any padding which will be provided | |
389 | * from a preregistered zero buffer. | |
390 | */ | |
ac920d04 | 391 | rc = rpcrdma_buffer_create(new_xprt); |
f58851e6 TT |
392 | if (rc) |
393 | goto out3; | |
394 | ||
395 | /* | |
396 | * Register a callback for connection events. This is necessary because | |
397 | * connection loss notification is async. We also catch connection loss | |
398 | * when reaping receives. | |
399 | */ | |
5abefb86 CL |
400 | INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, |
401 | xprt_rdma_connect_worker); | |
f58851e6 | 402 | |
5231eb97 | 403 | xprt_rdma_format_addresses(xprt, sap); |
1c9351ee CL |
404 | xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); |
405 | if (xprt->max_payload == 0) | |
406 | goto out4; | |
407 | xprt->max_payload <<= PAGE_SHIFT; | |
43e95988 CL |
408 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", |
409 | __func__, xprt->max_payload); | |
f58851e6 TT |
410 | |
411 | if (!try_module_get(THIS_MODULE)) | |
412 | goto out4; | |
413 | ||
5231eb97 CL |
414 | dprintk("RPC: %s: %s:%s\n", __func__, |
415 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
416 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
f58851e6 TT |
417 | return xprt; |
418 | ||
419 | out4: | |
420 | xprt_rdma_free_addresses(xprt); | |
421 | rc = -EINVAL; | |
422 | out3: | |
7f1d5419 | 423 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
424 | out2: |
425 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
426 | out1: | |
e204e621 | 427 | xprt_free(xprt); |
f58851e6 TT |
428 | return ERR_PTR(rc); |
429 | } | |
430 | ||
431 | /* | |
432 | * Close a connection, during shutdown or timeout/reconnect | |
433 | */ | |
434 | static void | |
435 | xprt_rdma_close(struct rpc_xprt *xprt) | |
436 | { | |
437 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
438 | ||
439 | dprintk("RPC: %s: closing\n", __func__); | |
08ca0dce TT |
440 | if (r_xprt->rx_ep.rep_connected > 0) |
441 | xprt->reestablish_timeout = 0; | |
62da3b24 | 442 | xprt_disconnect_done(xprt); |
282191cb | 443 | rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
444 | } |
445 | ||
446 | static void | |
447 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
448 | { | |
449 | struct sockaddr_in *sap; | |
450 | ||
451 | sap = (struct sockaddr_in *)&xprt->addr; | |
452 | sap->sin_port = htons(port); | |
453 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; | |
454 | sap->sin_port = htons(port); | |
455 | dprintk("RPC: %s: %u\n", __func__, port); | |
456 | } | |
457 | ||
458 | static void | |
1b092092 | 459 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 460 | { |
f58851e6 TT |
461 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
462 | ||
0b9e7943 TM |
463 | if (r_xprt->rx_ep.rep_connected != 0) { |
464 | /* Reconnect */ | |
5abefb86 CL |
465 | schedule_delayed_work(&r_xprt->rx_connect_worker, |
466 | xprt->reestablish_timeout); | |
0b9e7943 | 467 | xprt->reestablish_timeout <<= 1; |
bfaee096 CL |
468 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
469 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
470 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
471 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 | 472 | } else { |
5abefb86 | 473 | schedule_delayed_work(&r_xprt->rx_connect_worker, 0); |
0b9e7943 | 474 | if (!RPC_IS_ASYNC(task)) |
5abefb86 | 475 | flush_delayed_work(&r_xprt->rx_connect_worker); |
f58851e6 TT |
476 | } |
477 | } | |
478 | ||
f58851e6 TT |
479 | /* |
480 | * The RDMA allocate/free functions need the task structure as a place | |
481 | * to hide the struct rpcrdma_req, which is necessary for the actual send/recv | |
0ca77dc3 CL |
482 | * sequence. |
483 | * | |
484 | * The RPC layer allocates both send and receive buffers in the same call | |
485 | * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer). | |
486 | * We may register rq_rcv_buf when using reply chunks. | |
f58851e6 TT |
487 | */ |
488 | static void * | |
489 | xprt_rdma_allocate(struct rpc_task *task, size_t size) | |
490 | { | |
a4f0835c | 491 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
0ca77dc3 CL |
492 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
493 | struct rpcrdma_regbuf *rb; | |
494 | struct rpcrdma_req *req; | |
495 | size_t min_size; | |
a0a1d50c | 496 | gfp_t flags; |
f58851e6 | 497 | |
0ca77dc3 | 498 | req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
c977dea2 CL |
499 | if (req == NULL) |
500 | return NULL; | |
f58851e6 | 501 | |
a0a1d50c CL |
502 | flags = GFP_NOIO | __GFP_NOWARN; |
503 | if (RPC_IS_SWAPPER(task)) | |
504 | flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; | |
505 | ||
85275c87 CL |
506 | if (req->rl_rdmabuf == NULL) |
507 | goto out_rdmabuf; | |
0ca77dc3 CL |
508 | if (req->rl_sendbuf == NULL) |
509 | goto out_sendbuf; | |
510 | if (size > req->rl_sendbuf->rg_size) | |
511 | goto out_sendbuf; | |
512 | ||
513 | out: | |
f58851e6 | 514 | dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); |
575448bd | 515 | req->rl_connect_cookie = 0; /* our reserved value */ |
0ca77dc3 CL |
516 | return req->rl_sendbuf->rg_base; |
517 | ||
85275c87 CL |
518 | out_rdmabuf: |
519 | min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
520 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags); | |
521 | if (IS_ERR(rb)) | |
522 | goto out_fail; | |
523 | req->rl_rdmabuf = rb; | |
524 | ||
0ca77dc3 CL |
525 | out_sendbuf: |
526 | /* XDR encoding and RPC/RDMA marshaling of this request has not | |
527 | * yet occurred. Thus a lower bound is needed to prevent buffer | |
528 | * overrun during marshaling. | |
529 | * | |
530 | * RPC/RDMA marshaling may choose to send payload bearing ops | |
531 | * inline, if the result is smaller than the inline threshold. | |
532 | * The value of the "size" argument accounts for header | |
533 | * requirements but not for the payload in these cases. | |
534 | * | |
535 | * Likewise, allocate enough space to receive a reply up to the | |
536 | * size of the inline threshold. | |
537 | * | |
538 | * It's unlikely that both the send header and the received | |
539 | * reply will be large, but slush is provided here to allow | |
540 | * flexibility when marshaling. | |
541 | */ | |
542 | min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp); | |
543 | min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
544 | if (size < min_size) | |
545 | size = min_size; | |
546 | ||
547 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags); | |
548 | if (IS_ERR(rb)) | |
549 | goto out_fail; | |
550 | rb->rg_owner = req; | |
551 | ||
552 | r_xprt->rx_stats.hardway_register_count += size; | |
553 | rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf); | |
554 | req->rl_sendbuf = rb; | |
555 | goto out; | |
556 | ||
557 | out_fail: | |
f58851e6 | 558 | rpcrdma_buffer_put(req); |
0ca77dc3 | 559 | r_xprt->rx_stats.failed_marshal_count++; |
f58851e6 TT |
560 | return NULL; |
561 | } | |
562 | ||
563 | /* | |
564 | * This function returns all RDMA resources to the pool. | |
565 | */ | |
566 | static void | |
567 | xprt_rdma_free(void *buffer) | |
568 | { | |
569 | struct rpcrdma_req *req; | |
570 | struct rpcrdma_xprt *r_xprt; | |
0ca77dc3 | 571 | struct rpcrdma_regbuf *rb; |
f58851e6 TT |
572 | int i; |
573 | ||
574 | if (buffer == NULL) | |
575 | return; | |
576 | ||
0ca77dc3 CL |
577 | rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]); |
578 | req = rb->rg_owner; | |
579 | r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); | |
f58851e6 | 580 | |
0ca77dc3 | 581 | dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); |
f58851e6 | 582 | |
f58851e6 TT |
583 | for (i = 0; req->rl_nchunks;) { |
584 | --req->rl_nchunks; | |
6814baea CL |
585 | i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt, |
586 | &req->rl_segments[i]); | |
f58851e6 TT |
587 | } |
588 | ||
f58851e6 TT |
589 | rpcrdma_buffer_put(req); |
590 | } | |
591 | ||
592 | /* | |
593 | * send_request invokes the meat of RPC RDMA. It must do the following: | |
594 | * 1. Marshal the RPC request into an RPC RDMA request, which means | |
595 | * putting a header in front of data, and creating IOVs for RDMA | |
596 | * from those in the request. | |
597 | * 2. In marshaling, detect opportunities for RDMA, and use them. | |
598 | * 3. Post a recv message to set up asynch completion, then send | |
599 | * the request (rpcrdma_ep_post). | |
600 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). | |
601 | */ | |
602 | ||
603 | static int | |
604 | xprt_rdma_send_request(struct rpc_task *task) | |
605 | { | |
606 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 607 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
608 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
609 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 610 | int rc = 0; |
f58851e6 | 611 | |
e2377945 | 612 | rc = rpcrdma_marshal_req(rqst); |
6ab59945 CL |
613 | if (rc < 0) |
614 | goto failed_marshal; | |
f58851e6 TT |
615 | |
616 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
617 | rpcrdma_recv_buffer_get(req); | |
618 | ||
575448bd TT |
619 | /* Must suppress retransmit to maintain credits */ |
620 | if (req->rl_connect_cookie == xprt->connect_cookie) | |
621 | goto drop_connection; | |
622 | req->rl_connect_cookie = xprt->connect_cookie; | |
623 | ||
624 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) | |
625 | goto drop_connection; | |
f58851e6 | 626 | |
d60dbb20 | 627 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 TT |
628 | rqst->rq_bytes_sent = 0; |
629 | return 0; | |
575448bd | 630 | |
c93c6223 CL |
631 | failed_marshal: |
632 | r_xprt->rx_stats.failed_marshal_count++; | |
633 | dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", | |
634 | __func__, rc); | |
635 | if (rc == -EIO) | |
636 | return -EIO; | |
575448bd TT |
637 | drop_connection: |
638 | xprt_disconnect_done(xprt); | |
639 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
640 | } |
641 | ||
642 | static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
643 | { | |
644 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
645 | long idle_time = 0; | |
646 | ||
647 | if (xprt_connected(xprt)) | |
648 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
649 | ||
763f7e4e CL |
650 | seq_puts(seq, "\txprt:\trdma "); |
651 | seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", | |
652 | 0, /* need a local port? */ | |
653 | xprt->stat.bind_count, | |
654 | xprt->stat.connect_count, | |
655 | xprt->stat.connect_time, | |
656 | idle_time, | |
657 | xprt->stat.sends, | |
658 | xprt->stat.recvs, | |
659 | xprt->stat.bad_xids, | |
660 | xprt->stat.req_u, | |
661 | xprt->stat.bklog_u); | |
860477d1 | 662 | seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu\n", |
763f7e4e CL |
663 | r_xprt->rx_stats.read_chunk_count, |
664 | r_xprt->rx_stats.write_chunk_count, | |
665 | r_xprt->rx_stats.reply_chunk_count, | |
666 | r_xprt->rx_stats.total_rdma_request, | |
667 | r_xprt->rx_stats.total_rdma_reply, | |
668 | r_xprt->rx_stats.pullup_copy_count, | |
669 | r_xprt->rx_stats.fixup_copy_count, | |
670 | r_xprt->rx_stats.hardway_register_count, | |
671 | r_xprt->rx_stats.failed_marshal_count, | |
860477d1 CL |
672 | r_xprt->rx_stats.bad_reply_count, |
673 | r_xprt->rx_stats.nomsg_call_count); | |
f58851e6 TT |
674 | } |
675 | ||
d67fa4d8 JL |
676 | static int |
677 | xprt_rdma_enable_swap(struct rpc_xprt *xprt) | |
678 | { | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | static void | |
683 | xprt_rdma_disable_swap(struct rpc_xprt *xprt) | |
684 | { | |
685 | } | |
686 | ||
f58851e6 TT |
687 | /* |
688 | * Plumbing for rpc transport switch and kernel module | |
689 | */ | |
690 | ||
691 | static struct rpc_xprt_ops xprt_rdma_procs = { | |
e7ce710a | 692 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 693 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 694 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
695 | .release_request = xprt_release_rqst_cong, /* ditto */ |
696 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
697 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ | |
698 | .set_port = xprt_rdma_set_port, | |
699 | .connect = xprt_rdma_connect, | |
700 | .buf_alloc = xprt_rdma_allocate, | |
701 | .buf_free = xprt_rdma_free, | |
702 | .send_request = xprt_rdma_send_request, | |
703 | .close = xprt_rdma_close, | |
704 | .destroy = xprt_rdma_destroy, | |
d67fa4d8 JL |
705 | .print_stats = xprt_rdma_print_stats, |
706 | .enable_swap = xprt_rdma_enable_swap, | |
707 | .disable_swap = xprt_rdma_disable_swap, | |
4a068258 | 708 | .inject_disconnect = xprt_rdma_inject_disconnect |
f58851e6 TT |
709 | }; |
710 | ||
711 | static struct xprt_class xprt_rdma = { | |
712 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
713 | .name = "rdma", | |
714 | .owner = THIS_MODULE, | |
715 | .ident = XPRT_TRANSPORT_RDMA, | |
716 | .setup = xprt_setup_rdma, | |
717 | }; | |
718 | ||
ffe1f0df | 719 | void xprt_rdma_cleanup(void) |
f58851e6 TT |
720 | { |
721 | int rc; | |
722 | ||
3a0799a9 | 723 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f895b252 | 724 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
725 | if (sunrpc_table_header) { |
726 | unregister_sysctl_table(sunrpc_table_header); | |
727 | sunrpc_table_header = NULL; | |
728 | } | |
729 | #endif | |
730 | rc = xprt_unregister_transport(&xprt_rdma); | |
731 | if (rc) | |
732 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
733 | __func__, rc); | |
951e721c CL |
734 | |
735 | frwr_destroy_recovery_wq(); | |
f58851e6 TT |
736 | } |
737 | ||
ffe1f0df | 738 | int xprt_rdma_init(void) |
f58851e6 TT |
739 | { |
740 | int rc; | |
741 | ||
951e721c | 742 | rc = frwr_alloc_recovery_wq(); |
f58851e6 TT |
743 | if (rc) |
744 | return rc; | |
745 | ||
951e721c CL |
746 | rc = xprt_register_transport(&xprt_rdma); |
747 | if (rc) { | |
748 | frwr_destroy_recovery_wq(); | |
749 | return rc; | |
750 | } | |
751 | ||
3a0799a9 | 752 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 753 | |
3a0799a9 CL |
754 | dprintk("Defaults:\n"); |
755 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
756 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
757 | xprt_rdma_slot_table_entries, | |
758 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
3a0799a9 | 759 | dprintk("\tPadding %d\n\tMemreg %d\n", |
f58851e6 TT |
760 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
761 | ||
f895b252 | 762 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
763 | if (!sunrpc_table_header) |
764 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
765 | #endif | |
766 | return 0; | |
767 | } |